It is difficult to make blanket statements like that. DS was 10th in the REGION on rings his 1st year of level 5. 2nd year, he placed in teh state on floor, pommel, rings, and all around, and in the region. He did a 3rd year of 5. We were accused of sandbagging. But in reality, his high bar was SO bad that he could not move on. It did him wonders in his overall development, allowing him to perfect the basics on all events. At the time, I was not too happy, but I see the benefits now.
It is hard to remember, that the placements should not matter that much. Kids know how they did. D won a meet last year with 5 falls, and then didn't place in meets where he had his best scores. They truly know what matters. He was much happier in the meets that he did well in, placement or not, than he was with his first place in that one meet.
Kids do not progress on a continuum, and while it may seem like one thing to us (sandbagging), there may be a completely different reason. I think we just have to celebrate progress and enjoy it rather than worry about what others are doing